Lily was leaning over the centre console of my car, and had my cock deep down her throat when I saw movement in the rearview mirror. “Someone’s coming” I whispered. I heard and felt her murmur acknowledgement, but she didn’t stop sucking me, her head bobbing down in my lap, and I didn’t stop playing with her pussy. Her panties were pulled to the side and I’d been tracing my fingers the length of her pussy, playing with her pussy lips and lightly circling her clit before slipping two fingers up and inside her.

There were two other cars in the reserve so we were ready for the chance we'd be interrupted and had parked accordingly, backed into the corner on an angle.

At first I just saw their heads - 2 girls in their twenties, one blonde, one brunette - but then as they walked around the dirt track at the edge of the carpark, I saw the blonde was carrying a rolled up camping mattress and her friend was carrying a large blanket.  Sexy images flashed into my head as I imagined what they might have been doing.  My fingers worked faster and more firmly on Lily's clit and she moaned in approval.

When I saw a guy emerge from the same direction as the girls had come from I was sure my imaginings were close to the truth. He was broad and muscular, heavily tattooed, with a shaved head.  “They’ve been down the path fucking” I said, almost talking to myself as my fingers slid in and out of Lilly's wet pussy. That was enough to distract Lily and she sat up quickly, taking in the situation. The girls were loading the mattress and blanket into the back of the hatchback closest to us, and the guy was walking to the other car on the other side of the parking area.

The sudden movement in our car must’ve caught the brunette girl's attention and she glanced to the side to look at us. Seeing Lily in the passenger seat when previously only I was visible was a dead giveaway as to what we’d been doing, and the naughty grin on the brunette's face told me she knew.

I read her lips “Dirty fucks” she said before turning to her friend, who was now looking in our direction too. I couldn’t see or hear what the brunette was saying, but the blonde smiled broadly.

“Fuck, they’re hot” Lily said with a naughty grin. She lowered her window and waved at the girls to come over.  “Bring your friend too” she called out, but too late, as the guy's car headed away in the other direction.

The girls both walked towards us with grins on their faces. “Let's give them a show” Lily said, bunching her dress around her waist and slipping her panties off, before leaning over and taking my cock in her mouth again. Lily lifted her leg, exposing her pussy and my hand went back to fingering her - she was even wetter than before.

The girls both approached the passenger side and I watched their faces as they looked through the open window.  They were transfixed watching me play with Lily's pussy and Lily running her tongue around the tip of my cock, before sucking my cock into her mouth. The look of lust grew on both girls' faces, and when I caught the eye of the blonde, she smiled and started caressing her tits. When she started squeezing her nipples hard between her thumbs and forefingers she closed her eyes and moaned and I fought off the urge to come.

Lily sucked me ferociously, taking my whole cock into her throat, making loud gagging noises, before pulling her head away to stroke my cock, slippery with gag-spit. She kissed me, making small whimpering noises as my fingers flicked her clit. She reached across me with one arm and unlocked my door and pushed it open. I looked over and saw the brunette take that as an invitation to open the passenger's door as her blonde friend moved around to my side of the car.